Bathtub



FIG. 1 is a perspective view of a bathtub showing our new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line showing of the remainder of the bathtub is forillustrative purposes and forms no part of the claimed design.

The ornamental design for a bathtub, as shown and described.